package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//判断员工是否登录
@Slf4j
@WebFilter("/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
                         FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到的请求为:{}", requestURI);

        //设置需要放行的路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "common/**",
                "/user/login",
                "/user/sendMsg"
        };
        //判断本次请求是否要处理
        boolean check = check(urls, requestURI);

        //如果不需要处理,直接放行
        if (check) {
            log.info("本次放行的请求为:{}", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }


        //判断是否登录,如果登录直接放行
        if(request.getSession().getAttribute("employee") !=null){
            log.info("用户已经登录,id为:",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");

        //如果未登录,则向客户端返回响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }



    //路径匹配,检查是否需要放行
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls){
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }


}
